Illuminating base



FIG. 1 is a top, front and left side perspective view of an illuminating base showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing the environment in the figures are for illustrative purpose only and form no part of the claimed design. 

The ornamental design for an illuminating base, as shown and described. 